Generator terminal shield



F. G. GARDNER ET-AL 2,038,353 l E GENERATOR TERMINAL SHIELD April 2l,1936.

Filed April 6, 1935 INVENTORS ATTORNEY v Patented Apr. 21, 1936 UNITEDSTATES 2,038,353 GENERATOR TERMINAL SHIELD Frank G. Gardner and ConradG. Merrill, Newark, N. J., assignors to Breeze Corporations, Inc.,Newark, N. J., a corporation of New Jersey Application April 6, 1935,Serial No. 4174,973

4 Claims.

This invention relates to shields for the terminals of electricaldevices.

Where radio is used in close proximity to an internal combustion engineor under circumstances wh'ere current is flowing through an electricalsystem, interference with the radio equip,-

ment is experienced. This is caused by the ema- .nation of electricalimpulses from the devices or wires carrying the current. In 'order toavoid such interference it is necessary to surround `the electricalconductors and. the various electrical devices with conductive housingswhich will prompt lydissipate such emanations to ground. In connectionwith the use of radio in the vicinity of an internal combustion engine,and particularly in aircraft practice, it is necessary to shield theentire ignition system, including its auxiliary units to avoidinterferencr The object of this invention is to provide a simple,eiective and easily installed radio shield for the terminal of anelectrical unit, and particularly the terminal of the common form ofgenerator used on aircraft.

A further object of the invention is to provide.

change in the structure or assembly of the generator, and which willprovide means to co-opf erate with other shielding elements which shieldthe conductor leading to the generator.

Under normal conditions the casing of the generator proper is of metaland is grounded so that it is only necessary to shield the terminal' ofthe generator completely to shield this unit. However, it is, frequentlydesirable to use a condenser with the generator. Therefore, a furtherobject of the invention is to provide a radio shield'for theterminal ofthe generator with which shield a condenser may be used. Al furtherobject of the invention is to provide a condenser of such constructionthat it maybe readily applied to the shield without change in thestructure of the shield.

The invention consists of the construction,y

the parts forming the invention herein, and in which:

-an annular bead I 6.

Figure 1 is a vertical section, partly in elevation, showing theapplication of the shield to the /t'erminal of the generator; and,

Figure 2 is a vertical section, partly in elevation, showing theapplication of the condenser to the generator and shield. 5

Referring to the drawing, A designates the casing of a generator whichis provided with the usual terminal B having a threaded binding post C.'Ihe post C is adapted to receive a metal contact tip D of the insulatedconductor E.

Surrounding the terminal B is an open-ended tubular metallic shield 3having an i'nturned flange 4 formed at the bottom thereof. The flange 4is curved to conform'to the contour of the generator A. The upper end ofthe tubular 15 member 3 is formed with a screw-threaded neck 5 which isnormally closed byY a disc 8 resting on the neck 5, and the disc 6 isheld` securely in position by means of a coupling nut 1.

In order to hold the member 3 on the gener- 20 ator A, a composition orother washer 8 is disposed around the terminal B. 'Ihe washer 8 issurmounted by a metal Washer 9 and a nut IIJ is applied on the post C toforce the washers 8 and 9 against the ange 4, which in turn is 25 forcedagainst the generator A, thus holding the tubular member 3 rigidly inposition on the generator A.

In the assembly of the device the nut 'I and the disc 6 are removed sothat a socket wrench or 30` other tool may be inserted through the opentop of the member 3 to secure the nut III in position.

The contact tip D is then applied to the post C and a second nut II isapplied to the post 35 C to securely hold the contact member D.

The tubular member 3 is provided with a substantially tubular lateralextension I2 terminating in a threaded neck I3 adapted to receive thecoupling nut G of a* shieldingconduit F. 40 The conductor E extendsthrough the extension I2 and the conduit F.

Referring to Figure 2, I4 designates a condenser, the metal casing ofwhich forms one con# tact and the'opposite contact is in the form of a45 coil spring I5. The condenser I4 is formed with When it is desired touse the condenser I4., the nut 'lis removed and the dis'c 6 isdiscarded. The condenser lI4is of such size that it lmay be entered inthe upper end of the tubular member 3 and the bead I6 ywill rest on theupper edge of the neck 5. The nutV 'I is then applied over the condenserI 4 and tightened on the neck 5 to hold the condenser securely inposition. The spring I5. is compressedagainst casing of the condenser Ilis grounded through the tubular member i and the generator A.

From the foregoing it will be seen that with the construction, shown inFigure 1 a complete shield is provided for the terminal of thegenerator. As shown in Figure 2 the shield readily lends itseli'to theuse therewith of acondenser and the condenser is entirely shielded. 1

Having thus fully described the invention, what is claimed as new anddesired to be secured by Letters Patent is:

1. In combination with a generator terminal and a radio shield therefor,a tubular condenserr formed with an annular bead and a spring contact,said spring contact being shielded by the terminal shielding means.

2. A radio shield for the terminal of a generator comprising anopen-ended. Substantially* tubular member surrounding the terminal, anntemal flange formed on the lower edge of the member and in contact withthe generator, a washer surrounding the terminal and bearing against theflange, a nut on the terminal to hold the shield in position, a discdisposed on the upper end of the open-ended member, a remov- 2,038,353`the post C to make contact therewith, and the able coupling nut to holdthe disc in position and a lateral extension on the tubular member.

3. A radio shield for the terminal of a generator comprising a. tubularmember surrounding the terminal and extending past the upper endthereof, means carried by the terminal to hold the tubular member inposition, a condenser disposed in the upper end of the tubular member,said condenser having a spring contact in contact with the terminal, anannular bead on the condenser resting on the upper end of the tubularmember, means to hold the condenser in position and a lateral extensionon the tubular member to admit the insertion o1' a conductor.

4. In combination with a generator terminal and a radio shield therefor,a tubular condenser formed with an annular bead, said condenser having ametal casing grounded to the shield and a spring insulated from thecasing, said casing forming one contact'of the condenser and said springforming a second Contact, the ungrounded portion of the condenser beingshielded by the terminal shielding means.

FRANK G. GARDNER. CONRAD G. MERRILL.

